63720664 has 16 divisors (see below), whose sum is σ = 136544400. Its totient is φ = 27308832.

The previous prime is 63720619. The next prime is 63720667. The reversal of 63720664 is 46602736.

63720664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63720667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 568879 + ... + 568990.

It is an arithmetic number, because the mean of its divisors is an integer number (8534025).

Almost surely, 2^63720664 is an apocalyptic number.

It is an amenable number.

63720664 is an abundant number, since it is smaller than the sum of its proper divisors (72823736).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63720664 is a wasteful number, since it uses less digits than its factorization.

63720664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1137882 (or 1137878 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 34.

The square root of 63720664 is about 7982.5224083619. The cubic root of 63720664 is about 399.4172012765.

The spelling of 63720664 in words is "sixty-three million, seven hundred twenty thousand, six hundred sixty-four".